The thing is just really cool. Basically I just bought it because it was a good deal (on a discount site) but I really like this thing. It's so accurate! I thought it wasn't very accurate (around 0.1 degrees) but it was. When I measured my square (45 and 90) it was 89.9 on one side and 90.0 on the other. When I measured the 45 degree square it showed 45.0. Also if I measured the flat side of the square (fully open it would be 179.9 or 180.0). Those are good tolerances if you ask me! It also has a clear button. It was also very useful for subtracting or counting from an angle. You can hold it at an existing angle and press the reset button to zero. Then you can add or subtract that angle. You can do different things like this. The quality seems pretty good too. (This is one of the things I would like to give 6 stars for.)
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